hunter



Feb. 21, 1956 s. L. HUNTER 2,735,366

REVERSIBLE PUMP Filed Sept. 15, 1951 v 2 Sheets-Sheet 1 III ScoTT L. HUNTER INVENTOR.

ATTORNEY Feb. 21, 1956 s HUNTER 2,735,366

REVERSIBLE PUMP Filed Sept. 15, 1951 2 Sheets-Sheet 2 ScoTT L. HUNTER 44 INVENTOR.

BYWKW ATTORNEY Ira- United States Patent REVERSIBLE PUMP Scott L. Hunter, Ossian, Ind. Application September 15, 1951, Serial No. 246,779 16 Claims. (Cl. 103-3) This invention relates to reversible pumps. More specifically, it relates to a piston type of pump through which the flow of fluid can be reversed by merely rotating the piston through 180 degrees.

It is an object of the invention to provide a pump which is simple and which is inexpensive to manufacture.

Another object of the invention is to provide a reversible pump which is also double acting.

A further object of the invention is to provide a reciprocating pump in which the valves and strainer are incorporated in the plunger.

Yet another object of the invention is to produce a pump which can be quickly and easily adjusted so that it will move liquid in a reverse direction.

These and other objects will become apparent from a study of this specification and the drawings which are attached hereto, made a part hereof and in which:

Figure 1 is a vertical section through the pump taken substantially on line 1-1 of Figure 2 showing the plunger, body, valves and strainer.

Figure 2 is a horizontal cross-sectional view of the pump taken substantially on line 22 of Figure 1.

Figure 3 is a view similar to that of Figure 1, but showing the plunger rotated 180 degrees to pump liquid in a direction opposite to that of Figure 1.

Referring particularly to Figures 1 and 2, the numeral 1 designates the pump body generally which has a head 3 formed integrally therewith at the upper end and is provided with a bore 5. A packing box 7 is formed in the head coaxially with the bore and a coaxial hole 11 is formed in the head for passage of'the piston rod 13. A suitable packing 8 and gland 9 are provided to seal the box.

Pipe connections 15, 17 are opposed sides of the body, forms a diameter of the bore.

A head 19 is fixed to the body by means of suitable fasteners 21 so as to close the bore.

The piston or plunger 23 is provided with radial flanges 25, 26 which are grooved at 27 on their outer peripheries to receive piston rings 29. The flanges are integral with a central, diametrical wall 31 which is enlarged at 33 to form a hub which is bored at 35 by means of which it is attached to the inner end of the piston rod by any suitable means.

The lateral edges of the wall 31 are enlarged as at 39 and centrally grooved as at 41 (Figure 2). A seal strip 43 is disposed in the groove for contact with the bore to prevent passage of liquid past the ends of the wall.

A substantially semi-cylindrical strainer or screen 45 has its ends fixed to the wall adjacent the enlarged portions 39 and its edges to inwardly directed flanges 46.

The piston is thus formed into two separate chambers, 47 which is the intake chamber, entrance to which is proprovided on diametrically the common axis of which tected by the screen and 49 which is the discharge chamber.

Intake ports 51, 53 are formed in the flanges 25, 26 in communication with the intake chamber While discharge Patented Feb. 21, 1956 ports 55, 57 are formed in the respective flanges communicating with the discharge chamber.

Ports 51, 53 are countersunk from the exterior and intake valves 59, 61 are disposed to seat in the recesses to seal the ports. The valves are preferably thin stampings and are axially pierced to receive the buttons 63, 65 which are connected by tension spring 67.

Ports 5 5, 57 are surrounded internally by raised bosses 58, 60 which form seats for the discharge valves 69, 71 similar to the intake valves. A compression spring 73 is seated in depressions formed in the valves and serves to hold them on the seats.

A lug is formed on the head 3 adjacent the packing box. A link 75 is pivotally mounted on a pin 77 whichis removably mounted in the lug.

A lever 79 is pivotally connected at 81 to the outer end of the piston rod and to the outer end of the link at83.

Operation As shown in Figures 1 and 2, as the lever the plunger will descend and valve 59 will open to draw liquid from inlet 15 through screen 45, chamber 47, port 51 into the top portion of the cylinder. Meanwhile, the liquid in the chamber below the piston is being forced to the outlet 17 through port 57, valve 71 and chamber 49.

When the lever is depressed, the piston will rise and liquid will be drawn from 15 through the screen 45, chamber 47, port 53, valve 61 into the cylinder below the piston while the liquid in the upper portion of the cylinder is displaced through port 55, valve 69, chamber 49 to outlet 17 The wall 31 prevents by-passing of liquid directly between chambers 47, 49.

In order to reverse the flow of liquid, so that it will be drawn into connection 17 and discharged through 15,

79 is lifted,

as shown in Figure 3, either the pin 77 or 83 is removed,

form, structure and arrangement of parts without departappli ing from the spirit of the invention. Accordingly, cant does not desire to rnent disclosed herein tion; but instead, he desires protection falling fairly within the scope of the appended claims.

What I claim to be new ters Patent of the United States is:

be limited to the specific embodil. A pump comprising a cylinder having a number-of ports disposed at different circumferential positions on said cylinder, a piston rotatably and reciprocably mounted in the cylinder, means defining a chamber in the piston which in one rotated position will communicate with one port and in a different rotated position will communicate with another port, port means in the piston disposed'to establish communication between the chamber and an end of the cylinder, valve means for controlling the port means, and valve means associated with the port which constitutes the outlet port.

primarily for purposes of illustraand desire to protect by Let-- the'chamber and amend of the cylinder, valve means for controlling. .the. portmeans, and valveameans associated with the port which constitutes the outlet port.

3. A pump comprising a cylinder having a number of ports in' the :wall thereof in different circumferential positions, a piston reciprocably and rotatably mounted in the cylinder, said piston comprising means deiininga chamber therein which is in communication with one port in one rotative position and with another port in a difierent rotative position, means for rotativelypositioning the piston, port means in the piston disposed to establish communication between the chamber andan 'end of-the-cylinder, valve means for controlling said port means, and valvemeans-associated with the port which isnotin=com munication with said chamber.

4. A pump comprising a cylindefihavinganumbenof ports in the wall thereof-disposed in different circumferentialpositions, a singlepiston reciprocably mounted in the cylinder, said piston comprising means defining a pair of chambers therein, one disposed in communication with each of-said ports,=port'-means in the piston for establishing communication between each chamber and an end of the cylinder, inwardly opening valve means for the port means in .one chamber and outwardly opening valve meansin the port means .for the other chamber and means for reciprocating said piston.

-5. A-pump comprising a cylinder having a number of ports in the Wall thereof disposed in different circumferential positions, a piston reciprocably and rotatably mounted in the cylinder, said piston comprising means defining a pair of chambersin the piston, one disposed incommunication with each of said ports, port means .in the piston for establishing communicationbetween each chamber and an end of the cylinder, inwardly opening valve means for the port means in one chamber and outwardly opening valve means in the port means for the other chamber, means for reciprocating said piston and means for positioning the piston with said chambers in one or the other of two-rotative positions with respect to the ports to control the direction of the flow of fluid throughthe cylinder ports.

6. -A pump comprising a cylinder having a number of ports in the wall thereof disposed in dilferent circumferential positions, a piston reciprocably mounted in the cylinder, said piston comprising means defining apair oi chambers .in the piston, one disposed in communication with cachet-said ports, port means in the piston for establishing communication between each chamber and an end of the cylinder, inwardly opening valve means for the ,port means in .one chamber and outwardly opening valve means in stheport means for the other chamber, means for reciprocating said'piston and a strainer forming a wall of the chamber containing the outwardly opening valve means, said strainer being disposed adjacent a cylinder port.

7. A pump comprising a cylinder having a painofcircumferentially-spaced.ports, avsingle piston reciprocably mounted inthe cylinder, said piston comprising'two axially spaced heads positioned in sealing relation transversely of said cylinder, said heads being connected by a cylinder contacting wall-which forms with said heads and cylinder twochambers, one in communication with each port,'port meansin each chamber communicating with each end ofthe cylinder, inwardly opening valves in the port means ofone chamber and outwardly opening valves inzthe port means ofthe other chamber and means on the cylinder for reciprocating said piston.

,3, v A pump comprising a cylinder having a pair of circumferentially spaced ports, a single piston reciprocably mounted'in the cylinder, said piston comprising two axially spaced ;heads.positioned in sealing relation transversely ofsaid cylinder, said heads beingconnected by a cylinder contacting wall Whichtorms with 'said heads, and cylinder two fichambers, one in communication with each port, pnrt=means in each chamber communicating withthe same end of the cylinder, inwardly opening valve means in the uport means of one chamber and-outwardlyopening valve means in the port means of the other chamber and means for reciprocating the piston.

9. A pump comprising a cylinder having a pair of circuint'erentially spaced ports, a piston reciprocably mounted in the cylinder, said piston comprising two axially spaced heads positioned'in sealing relation transversely of said cylinder, said heads being connected by a cylinder contacting wall which forms with said'heads and cylinder two chambers, one in communication with each port, port means in each chamber communicating with each end of the cylinder, inwardly opening valves in the port means of one chamber and outwardly opening valves in the port means of the other chamber, means on the cylinder for reciprocating said piston, means for rotating said piston to alternate the chambers and ports to reverse the flow of fluid through the ports.

10, Apump comprising a cylinder having a pair of'circumferentially spaced ports, apiston reciprocably mounted in the cylinder, said piston comprising two axially spaced heads positioned transversely of and in sealing relation with said cylinder, said heads being connected'by a cylinder contacting wall which forms with said heads and cylinder two chambers, one in communication with each port, port means in each chamber communicating with each end of the cylinder, inwardly opening valves in'the port means of one chamber and outwardly opening valves in the port means of the other chamber, means on the cylinder for reciprocating said piston and a screen'fixed to the headsand'to the wall adjacent the cylinder to enclose the chamber having the outwardly opening valves.

11. A pump comprising a cylinder having a pair of circumferentially spaced ports, a piston reciprocably mounted in the cylinder, said piston comprising two axially spaced heads positioned in transverse sealing relation'with .said cylinder, said heads being connected by a cylinder contacting wall which forms with said heads and cylinder two chambers, one in communication with each port, port means in each chamber communicating with each end of the cylinder, inwardly openings'valves in the port means of one chamber and outwardly opening valves in the port means of the other chamber and means on the cylinder for reciprocating said piston comprising apiston rod attached to the piston and projecting through one endof the cylinder, a lever pivotally mounted on the cylinder and having one end'pivotally connected to the rod.

12. A pump comprising a cylinder having a 'pair of circumferentially spaced ports, a piston reciprocably mounted in the cylinder, said piston comprising two axially spaced heads positioned in sealing relation with said cylinder, said heads being connected by a cylinder contacting wall which forms with said heads and cylinder two chambers, one in communication with each port, port.

means in each chamber communicating with each end "of thecylinder, inwardly opening valves in the port means of one chamber and outwardly opening valves in 'the port means of the other chamber and means on the cylinder for reciprocating said piston comprising a piston rod attached to the piston and projecting through one end of the cylinder, a lever'pivotallymounted on the cylinder and having one end pivotally connected to the rod, said lever and mounting serving to hold'the piston in one or the other of two rotatedpositions with one chamber in communication with one or the other of said cylinder ports and the other chamber in communication with-the remaining port.

13. A pump comprising a cylinder having a pair of circumferentially spaced ports, a single piston reciprocably mounted in the cylinder, said piston comprising two "axially spaced heads positioned in sealing .relation with said cylinder, said heads being connected by a cylinder contacting wall which .forms with said heads and cylinder two chambers, one in communication with each port, sealing means disposed between the cylinder contacting portions of the wall and the cylinder, port means in each chamber communicating with an end of the cylinder, inwardly opening valve means in the port means of one chamber and outwardly opening valve means in the port means of the other chamber and means on the cylinder for reciprocating said piston.

14. A pump comprising a cylinder having a pair of circumferentially spaced ports, a piston reciprocably mounted in the cylinder, said piston comprising two axially spaced heads, including piston rings, positioned in sealing relation with said cylinder, said heads being connected by a cylinder contacting wall which forms with said heads and cylinder two chambers, one in communication with each port, port means in each chamber communicating with an end of the cylinder, inwardly opening valve means in the port means of one chamber and outwardly opening valve means in the port means of the other chamber and means on the cylinder for reciprocating said piston.

15. A pump comprising a cylinder having a pair of circumferentially spaced ports, a single piston reciprocably mounted in the cylinder, said piston comprising two axially spaced heads positioned in sealing relation with said cylinder, said heads being connected by a cylinder contacting wall which forms with said heads and cylinder two chambers, one in communication with each port, port means in each chamber communicating with an end of the cylinder, inwardly opening valve means in the port means of one chamber and outwardly opening valve means in the port means of the other chamber and means on the cylinder for reciprocating said piston, the axial length of said chambers being so related to the length of stroke of the piston that the piston heads do not pass the ports in the cylinder.

16. A pump comprising a cylinder having a pair of circumferentially spaced ports, a single piston reciprocably mounted in the cylinder, said piston comprising two axially spaced heads positioned in sealing relation with said cylinder, said heads being connected by a cylinder contacting wall which forms with said heads and cylinder two chambers, one in communication with each port, port means in each chamber communicating with an end of the cylinder, inwardly opening valve means in the port means of one chamber and outwardly opening valve means in the port means of the other chamber and means on the cylinder for reciprocating said piston, the axial length of said piston being greater than the stroke of the piston to prevent direct communication between the cylinder ports and the end of the cylinder.

References Cited in the file of this patent UNITED STATES PATENTS 

